在管道施工图中，平面图的右上角往往画有（），实际施工时，管道的走向都要靠它来确定。A

根据句意及首字母提示填单词，完成句子。

1. Do we have to wear a u______ at school?

2. The students are having an English class in the c______.

3. I have to w______ my clothes on the weekend.

4. I had a f______ with Bob and we didn't speak to each other after that.

5. She didn't a________ in New York in the morning, but in the afternoon.  

同时测定下列哪种血清酶有助于鉴别ALP升高的来源（）

A.ACP

B.AST

C.CK

D.LD

E.GCT

It is required that you _____ at six. [ ]

A. will arrive

B. arrive

C. arrived

D. would arrive

(每题的备选答案中，只有一个最正确或最符合题意。)

一般情况下，存货占企业总资产的( )左右。

A．10%

B．20%

C．30%

D．40%

尘肺病分为几期？